Sewing-machine.



G. F. GRAY & P. S. WOODHEAD.

SEWING MACHINE. APPLICATION FILED DEO.13,1911.

1, 1 1 1,828, Patented Sept. 29, 1914;

3 SHEETS-SHEET 1.

WITNESSES:

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0. F. GRAY & P. S. WOODHEAD. SEWING MACHINE.

APPLICATION FILED DECLIB, 1911. 1,1 1 1,828.

Patented Sept. 29, 1914.

3 SHEETS-SHEET 2.

IN VE/V TORS.

Giza, 2-Z6Fra and G. P. GRAY & P. S WOODHEAD. SEWING MACHINE.

APPLICATION FILED DEO.13, 1911. 1,1 1 1,828.

Patented Sept. 29, 1914.

3 SHBETSSHEET 3.

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A TTOR/VE Y I a vcitizen of the United States, and resident To all whom it may concern:

"[uvITEDsTATES PATENT OFFICE.

'oH-ARILns F; GRAY, or .sIERnA MADRE, CALIFORNIA, AND FRANK s.. WOODHEAID. or

WORTENDYKE, NEW JERSEY, ssIeNons ro- THESINGER MANUFACTURING COM- IPANY, A coaronArIo or NEW JERSEY,

1 sEwING-MAcI'II E.

Specification oi Iietter's latent. Patented Sept.29, 1914:.

1 Ap flicationfiledliecemher s,19 1i. S erial No.665,41'Z.

Be it known that vwe, CHARLES F. GRAY,

of Sierra Madre, in the county of Los Angeles and State of California, and FRANK S.

VVOODI-IEAI), a citizen of the United States,"

and residentof WVortendyke, in the county of Bergen and Stateof New Jersey,.have invented certain new and useful 'Impjrovcments in Sewing-Machines, of which the following is a specification reference being had therein to the accompanying drawings.

This invention relates to improvements in sewing machines, and has for itsobject to provide positively controlled adjusting means for determining the number of stitches to the inch arranged so as to be conveniently. manipulated by a removable key, the number of stitches indicated being at all times visible tothe person responsible for the character of the product. Further, the means for locking-and unlocking the adjusting means with respect to the main shaft is so constructed thatthekey cannot be removed from its unlocking position without tially such, as is represented by U. S. Patent- No. 929,761, issued August" 3, 1909 .to 0.; F.

Gray, except that-instead of employing a. belt as in the patented device, a 10oper-ac-' tuating shaft and crank connections are em-' ployed for. transmitting power from the main shaft to the loop-taker= shaft, but as the invention deals mainly with the cons'tructionand application-of the stitch-regulating mechanism, only such reference will be made to the other elements of the machine as is deemed necessary for a proper understanding .of its application.

' Referring to the accompanying drawings, in the several figures of which like parts are similarly designated, Figure 1 is a front side elevation of the sewing machine with the bracket arm partially broken out, and the feed-actuating elements carried by the main shaft shown substantially in central-vertical section. "Fig. 2 is a vertical crosssection on the line AA, Fig. 1. Fig. 3 is a front elevation of the rear portion of the sewing machine bed-plate and bracket arm, the latter being provided with a stitch-indicating Fig. 6 isa plan view of Fig. 5. Fig. 7 is a plan view of thefeed-adjust-ing disk and parts carried byit, looking from the rear end of the machine. Fig.8 is a plan View -ing from the front end of the machine.

of the feed-adjusting key. Fig.9 represents details in perspective later to be referred to.

'Fig. 10' is an underside view of Fig. 1.

Referring to the figures, 1 represents the bed-plate of the sewing machine upon which is mounted the bracket arm. comprising the arm-bracket 2 and standard 3, 1 the main or needle-bar-driving shaft provided at its rear end with a band or hand wheel 5, and at its opposite'end with the commonly-employed flange (not shown) carrying the usual needle-bar-a c't11ating link (not shown) operatively connected with the needle-bar 6 car-,

rying the eye-pointed needle 7, 8 the needlethread tension and 9 the needle-thread take- 'up, the latter being pivoted in the usual manncr upon a stationary portion of the bracket armandiactuated inthe usual manner from a suitable connection (not shown) "bar-actuating. shaft by suitable crank connections, as 13, said looper-actuating shaft carrying near its forward end a suitable spiral gear 1 1 which mesheswith a like gear 15 carried by. the. loop-taker shaft 16, and as said gears are of the ratio of two to'one, the'loop-taker shaft is given two revolutions to one revolution of said looper-actuating shaft.

The feed-drive shaft 17 is connected at its rear end by an arm 18 with a feed-link 19, the upper end of which is pivotally attached to an arm 20 of-a bell-crank lever 21 secured, by pinch joint 22 upon the needlevibrating shaft 23, said link and bell-crank lever comprising, a feed-drive connection.

, The lever 21 is provided with a forked opening 24 which embraces a block 25 in which is mounted a feed-eccentric 26 forming a part of the feed-adjusting disk 27, said block being held against accidental movement in the direction of the length of the main shaft by suitable flanges, as 28, located between the lever 21 and disk 27, and the opening 29 in said eccentric being of sufficient diameter to admit of the adjustment of said eccentric from a position concentric with respect to the axis of the main shaft to such eccentric position as is necessary for effecting the fewest number of stitches to the-inch required. The desired adjustment of the. eccentric 26 is effected by slightly withdrawing the feed-adjusting disk holding screw 30 from engagement with the shoe 31 located between the threaded end of said screw and the surface 32 of the feed-adjusting bracket 33 secured by screws, as 34, to the main shaft 4, thus permitting the feedadjusting disk 27 and its eccentric 26 to be swung on the pivot 35 to give more or less eccentricity to said eccentric and, accordingly, greater or less amplitude of movement to the feed-dog, it being understood that after the desired adjustment has been made the screw 30 is again tightened down upon the shoe 31 and acts to hold the eccentric-26 in its adjusted position.

Referring now to the means for controlling the adjustment of the stitch-forming mechanism and for indicating the number of stitches to the inch, the bracket arm is provided with a threaded bushing 36 in which is mounted a hollow plunger 37 on which is threaded a bracket 38 carrying a crank arm 39 and at its free end provided with a notch v 40 which coacts with a finger 41 carried by a rocking indicator 42 mounted on the threaded bushing 36, a spring 43 mounted on the smaller diameter 44 of the hollow plunger 37 and having one end seated on the flange 45 of said plunger and its opposite end upon the flange 46 of said threaded bushing normally acting to hold the bracket 38 in contact with the inner end wall of the bushing 36.

lVhen it is desired to change the number of stitches to the inch, the end 47 of the portable key 48 is passed into the opening 49 of the key-plate 5,0 and into the hollow plunger 37 until said end contacts with the periphery 51 of the feed-disk 27, when the operator manually turns the main shaft until the end 47 of said key enters the opening 52 in the screw 30, the projection 53 of said key acting upon the resiliently held plunger 37 to position the element 39 in the opening 54 of the bracket 55 rigidly secured by screws, as 56, to the hub 57 forming an integral part of the bracket 33, and as said key is turned to release the screw 30 from engagement with the shoe 31 the bracket or projection 53 is carried below the under surface of the cap 50 and turned to the left until the bracket 58 contacts with the wall 59 of said cap, followed by the operator manually turning the main shaft 4 until the point 60 of the indicator designates the required number of stitches to the inch, which is effected by the element 39 being seated in the opening 54 of the bracket 55 which, as has been previously pointed out, is rigid with respect to the main shaft 4, thus through the movements of the adjusting disk 27 with respect to the main shaft 4, the walls forming the opening 54 cause the indicator 42 to be rocked upon the threaded bushing 36 to the position indicating the desired number of stitches to the inch. After the desired adjustment of the indicator 42 has been effected, the key 48 is turned to the right to again place the screw 30 in engagement with the shoe 31, which places the projection 53 in alinement with the opening 49 in the cap 50, thus permitting the key to be removed from engagement with the machine.

Claims:.

1. In a sewing machine, the combination with fabric feeding and stitch forming mechanisms including a main shaft, a feeddrive shaft and a feed-drive connection, of a feed-adjusting bracket secured upon said main shaft and upon which is pivotally mounted a feed-adjusting disk provided with a feed-eccentric, and means including a key removable from the machine adapted to be placed into operative relationship with said feed-adjusting disk to release it from and secure it ineffective relationship with said feed-adjusting bracket and means for securing said key from removal except when in a predetermined position.

2. In a sewing machine, the combination with fabric feeding and stitch forming mechanisms including a main shaft, a feeddrive shaft and feed-drive connection, of a feed-adjusting bracket secured upon said main shaft and upon which is pivotally mounted a feed-adjusting disk provided with a feed-eccentric, a, key removable from the machine adapted to be placed into operative relationship with said feed-adjusting disk to release it from and secure it in effective relationship with said feed-adjusting bracket, and means including a rocking indicator for designating the number of stitches to the inch and means for securing said key from removal except when in a predetermined position.

3. In a sewing machine the combination with fabric-feeding an stitch-forming mechanisms including a main shaft, a feeddrive shaft and feed-drive connection, of a feed-adjusting bracket secured upon said main shaft and upon which is pivotally mounted a feed-adjusting disk provided with a feed-eccentric, a rocking indicator for designating the number of stitches to the inch adapted to be placed into and out of operative relationship with said feed-adjusting bracket, and means including a key-plate and portable key, the latter being provided with a step-projection and adapted to be placed into operative relationship with said feed-adjusting disk to release it from and secure it in effective relationship with said feed-adjusting bracket and means for securing said key from removal except when in a predetermined position.

4. In a sewing machine, the combination with fabricfeeding and' stitch-forming mechanisms including a main .shaft, a feeddrive shaft and feed-drive connection, of a feed-adjusting bracket secured on said main shaft and upon which is pivotally mounted a feed-adjusting disk rovided with a holding screw and a, eed-eccentric, a key adapted to temporarily engage said holdin screw to release said feed-adjusting; dis from and secure it in eflecti ve relationship with said feed-adjusting bracket, and means including a rocking indicator normally held out of but adapted to be placed into operative relationship with said last-mentioned bracket for designating the number of stitches to the inch.

5. In a sewing machine, the combination with fabric-feeding and stitch-forming mechanisms including a main shaft, a feeddrive shaft and feed-drive connection, of a feed-adjusting bracket secured upon said main shaft and upon which is pivotally mounted a feed-adjusting disk provided with a feed-eccentric, and means for securing and releasing said feed-adjusting disk with respect to said feed-adjusting bracket, said means including a key-plate, a key provided with a step-projection, and'a resiliently held hollow lunger, the latter be- 40 ing mounted in the liiracket arm and nor-6 mally acting to hold said key out of effective. relationship with the feed-adjusting mechanism.

6. In a sewing machine, the combination with fabricfeeding and stitchforming mechanisms includin a main shaft, a feeddrive shaft and a fee -drive connection, of a feed-adjusting bracket secured upon said main shaft and upon which is pivotally mounted a feedadjusting disk provided with a feed-eccentric, and means for releasing said feed-adjusting disk from and securingdt in efiective relationship with said feed-ad usting bracket, said means including a key and a key-plate, the latter cooperating with said key to hold it against displacement except at such time as the feed-adjusting disk is operatively connected with said feed-adjusting bracket.

In testimony whereof we have signedour names to this specification, in the presence of two subscribing witnesses.

CHARLES F. GRAY. FRANK S. WOODHEAD. Witnesses:

H. A. WOODHEAD, ADOLPH SCHLEICHER. 

